Definition from Wiktionary, the free dictionary
See also Koro
Malaysian, Indonesian for "turtle."
- (psychology) A delusional syndrome found in Malay and southern Chinese populations, characterized by a belief that the subject's penis will retract into the abdomen and cause death.
From Proto-Oceanic (compare Tongan kolo).
koro (used in the form koro-a)
Rapa Nui 
Usage notes 
Considered archaic; the following are preferred: